[pre-commit.ci] pre-commit autoupdate

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -1,16 +1,16 @@
 repos:
--   repo: https://github.com/ambv/black
-    rev: 19.3b0
+-   repo: https://github.com/psf/black
+    rev: 20.8b1
     hooks:
     - id: black
       language_version: python3.7
       exclude: ^docs/
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v1.2.3
+    rev: v3.4.0
     hooks:
     - id: flake8
--   repo: https://github.com/timothycrosley/isort
-    rev: 4.3.20
+-   repo: https://github.com/PyCQA/isort
+    rev: 5.7.0
     hooks:
     - id: isort
       name: isort